Benchmark: string forEach addition assignment vs reduce template literal vs map join

Script Preparation code:

var values = [];
for (let i = 0; i < 10000; ++i) {
  values.push(i);
}

Tests:

map, join
let result1 = values.map(v => `x = ${v}`).join(' or ');
forEach, addition assignment
let result2 = '0=1'; values.forEach(v => result2 += ` or x = ${v}`);
reduce, template literal
const result3 = values.reduce((a,v)=> `${a} or x = ${v}`, '0=1');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
map, join
forEach, addition assignment
reduce, template literal

Fastest: N/A

Slowest: N/A

Latest run results:

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Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what is being tested.

**Overview**

The benchmark compares four different approaches to add strings to an array:

1. `forEach` with addition assignment
2. `reduce` with template literals
3. `map` with join
4. Simple string concatenation using the `or` operator

**Library: Lodash**

In two of the test cases (`forEach, addition assignment` and `reduce, template literal`), a library called Lodash is used.

* In the `forEach, addition assignment` case, the `forEach()` function from Lodash is used to iterate over the array.
* In the `reduce, template literal` case, the `reduce()` function from Lodash is used with an arrow function as its callback.

Lodash is a popular JavaScript library that provides various utility functions for tasks such as array manipulation, string processing, and more. The `forEach()` and `reduce()` functions are commonly used in JavaScript programming.

**Special JavaScript Feature: Template Literals**

In the `map, join` case, template literals (`\`${...}\``) are used to create a new string.

Template literals are a feature introduced in ECMAScript 2015 (ES6). They allow you to embed expressions inside string literals using backticks (`) instead of double quotes or single quotes. This feature provides a more convenient way to build strings by inserting variables, functions, and other expressions into the string.

**Other Alternatives**

If Lodash is not available or desired, the following alternatives can be used:

* For `forEach` with addition assignment: `Array.prototype.forEach()` without Lodash
* For `reduce` with template literals: Using a vanilla JavaScript implementation of the `reduce()` function

Keep in mind that these alternatives may have slightly different performance characteristics and code readability compared to using Lodash.

**Pros and Cons**

Here's a brief summary of the pros and cons of each approach:

1. **Lodash (forEach, addition assignment)**:
	* Pros: Convenient, efficient, and easy-to-use.
	* Cons: Adds an external dependency, which may not be desirable in all projects.
2. **Reduce with template literals**:
	* Pros: Efficient and readable.
	* Cons: May require additional code to implement the `reduce()` function, and can be less performant than using Lodash's optimized implementation.
3. **Map with join**:
	* Pros: Easy to understand and implement.
	* Cons: May be slower due to the overhead of concatenating strings.
4. **Simple string concatenation (or)**:
	* Pros: Simple and straightforward.
	* Cons: Inefficient, as it involves multiple string allocations and copies.

Overall, the choice of approach depends on the specific use case, performance requirements, and personal preference.

Related benchmarks:

string forEach addition assignment vs reduce template literal vs map join (version: 0)

Comparing performance of: map, join vs forEach, addition assignment vs reduce, template literal

Created: 3 years ago by: Guest

Jump to the latest result

map, join

forEach, addition assignment

reduce, template literal

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):